CN107303463A - The innoxious removing low concentration of NO of high-gravity technologyxMethod - Google Patents

The innoxious removing low concentration of NO of high-gravity technologyxMethod Download PDF

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Publication number
CN107303463A
CN107303463A CN201610256236.0A CN201610256236A CN107303463A CN 107303463 A CN107303463 A CN 107303463A CN 201610256236 A CN201610256236 A CN 201610256236A CN 107303463 A CN107303463 A CN 107303463A
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China
Prior art keywords
innoxious
low concentration
removing low
concentration
rpb
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CN201610256236.0A
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Inventor
刘天成
徐元强
彭金辉
贾丽娟
段开娇
王博涛
高冀芸
赵光琴
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Yunnan Minzu University
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Yunnan Minzu University
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Priority to CN201610256236.0A priority Critical patent/CN107303463A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/77—Liquid phase processes
    • B01D53/78—Liquid phase processes with gas-liquid contact
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/54—Nitrogen compounds
    • B01D53/56—Nitrogen oxides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/10—Oxidants
    • B01D2251/106—Peroxides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2258/00—Sources of waste gases
    • B01D2258/02—Other waste gases
    • B01D2258/0283—Flue gases
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2259/00—Type of treatment
    • B01D2259/12—Methods and means for introducing reactants
    • B01D2259/124—Liquid reactants

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Treating Waste Gases (AREA)

Abstract

The invention discloses a kind of innoxious removing low concentration of NO of high-gravity technologyxMethod.This method utilizes high-gravity technology, using high gravity rotating packed bed device is innoxious and recycling treatment low concentration of NOx.Method is process object by 1% nitric oxide of concentration, using nitrogen as balanced gas, using high pure oxygen by NOxThe gaseous mixture of 500 ppm concentration is made into, is reacted in a counter-current fashion in RPB, absorbing liquid absorbing reaction product is used as using the mixed liquor of water and hydrogen peroxide in reaction.Using the method to NOxRemoval efficiency up to 50%~70%, to NO under the conditions of heavy forcexRemoval efficiency improve 5~6 times, reacted product can change into nitric acid through simple process, effectively realize NOxInnoxious and recycling treatment.

Description

The innoxious removing low concentration of NO of high-gravity technologyxMethod
Technical field
The present invention relates to a kind of innoxious removing low concentration of NO of high-gravity technologyxMethod, waste gas is innoxious and resource treatment technique field for category.
Background technology
The discharge of nitrogen oxides can destroy ecological environment, and health is produced a very large impact.As nitrogen oxides environmental pollution is increasingly serious and its discharge standard increasingly strict, denitration problem is also increasingly taken seriously, and with the appearance of newest waste gas emission standard, the disposal ability of the existing denitration device of many enterprises can not meet the requirement of national standard, need newly-built denitration device or add secondary denitration device.
Through retrieval, domestic nitrogen oxides treatment status is：Nitrous oxides exhaust gas is administered using catalytic reduction method more than large scale business enterprise, and the enterprise for accounting for the most middle and small scale of China is more by the way of wet denitration.For the present situation of denitration industry, and in view of the economic benefit of enterprise, we have proposed utilize the innoxious removing low concentration of NO of high-gravity technologyxMethod.
The innoxious removing low concentration of NO of high-gravity technologyxMethod, both can directly be applied in existing equipment, clean manufacturing recycling economy can be realized again, reacted product can change into nitric acid through simple process, effectively realize NOxInnoxious and recycling treatment.
The content of the invention
The invention provides the innoxious removing low concentration of NO of a high-gravity technologyxMethod, this method utilizes high-gravity technology, uses the innoxious removing low concentration of NO of high gravity rotating packed bed devicex.Choose the nitric oxide of content 1%（NO）For process object, high purity oxygen gas is utilized（O2≥99.999%）By NOxIt is passed through after the gaseous mixture for being made into 500 ppm concentration in reaction unit, with nitrogen in reaction（N2≥99.99%）For balanced gas, using water and hydrogen peroxide solution as absorbing liquid, realize to NOxThe innoxious and recycling treatment of gas.
Specific method：At ambient temperature, nitric oxide, oxygen, nitrogen are mixed according to certain ratio, is made into certain NOxThe simulated flue gas of concentration；High gravity rotating packed bed is opened, after after stabilization of speed；The absorption cycle liquid of peristaltic pump connection is connected, after absorbing liquid stability of flow, starts to be passed through simulated flue gas from air inlet, connects atmosphere sampling instrument in gas outlet after half an hour, it is ensured that air inlet is consistent with throughput is gone out, and uses National Standard Method：Determine nitrogen oxides-hydrochloride naphthodiamide AAS in air and survey its content, calculate this method NOxRemoval efficiency.
Nitrogen and oxygen suitable for the inventive method can be replaced with air, and the reaction is carried out under room temperature condition.
According to the method described in the present invention, oxygen content compares simulated flue gas（O2/NOx）Mol ratio be 5%, absorbing liquid from mass concentration be 0.1mol/L aqueous hydrogen peroxide solution.
According to the method described in the present invention, the RPB rotating speed in high gravity rotating packed bed reactor is 900rpm/min.
According to the method described in the present invention, the flow of simulated flue gas is fixed, according to the flow of the Flow-rate adjustment absorbing liquid of the simulated flue gas, selects simulated flue gas flow in this method and absorb the volume ratio of flow quantity（Q/L）For 10:1.
According to method of the present invention, before reaction, first turn on and peristaltic pump is opened after high gravity rotating packed bed, after absorbing liquid flowing to be recycled is stable, be passed through simulated flue gas；In course of reaction, it is ensured that the gas feed flow and gas rate of discharge of high gravity rotating packed bed are essentially identical；Reaction terminates, and the flue gas of collection gas vent is tested and analyzed.As a result show, the denitration efficiency of simulated flue gas is 50%~70%, and the detection of rich solution absorbing liquid shows, the nitrate ion of the liquid（NO3 -）Concentration is significantly increased.
Brief description of the drawings
Fig. 1 is the innoxious removing low concentration of NO of high-gravity technology of the present inventionxDevice flow chart.
Marked in figure：（1）Simulated flue gas import,（2）Simulated flue gas outlet,（3）Absorbing liquid import,（4）Absorbing liquid outlet,（5）RPB rotating shaft,（6）Seal,（7）Liquid distribution trough, (8) RPB filler,（9）RPB shell,（10）Motor,（11）Distribution mixing arrangement,（12）Mass flow controller,（13）Nitric oxide gas,（14）Nitrogen,（15）Oxygen,（16）Absorbing liquid circulating collection bottle,（17）Peristaltic pump,（18）Air sampler,（19）Nitrogen dioxide measure absorption bottle,（20）Oxidation of nitric oxide bottle,（21）Determination of nitric oxide absorption bottle.
Embodiment
In order to better illustrate and implement, the present invention is elaborated with reference to flow chart and specific implementation example.
Scheme 1：At ambient temperature, flow is formulated as 500ppm for the nitrogen premixing of 15ml/min nitric oxides, 15ml/min oxygen and 270ml/min, oxygen content is 5% NOxSimulated flue gas, it is passed into 300ml/min flow velocitys in the high gravity rotating packed bed of unlatching, packed bed rotational speed regulation is 800rpm/min, the circulating absorption solution of peristaltic pump connection is connected after stabilization of speed, it is 30ml/min that regulation, which absorbs flow quantity, after absorbing liquid stability of flow, gas vent is connected with atmosphere sampling instrument, gas feed is consistent substantially with rate of discharge in course of reaction, react 30min post-samplings, use National Standard Method（Nitrogen oxides-hydrochloride naphthodiamide AAS）NO in determination samplexContent.As a result show, method NOxRemoval efficiency up to 50~70%, to NO under the conditions of heavy forcexRemoval efficiency improve 5~6 times.
Scheme 2:At ambient temperature, flow is formulated as 500ppm for the nitrogen premixing of 25ml/min nitric oxide, 25ml/min oxygen and 450ml/min, oxygen content is 5% NOxSimulated flue gas, it is passed into 500ml/min flow velocitys in the high gravity rotating packed bed of unlatching, packed bed rotational speed regulation is 800rpm/min, the circulating absorption solution of peristaltic pump connection is connected after stabilization of speed, it is 100ml/min that regulation, which absorbs flow quantity, after absorbing liquid stability of flow, gas vent is connected with atmosphere sampling instrument, gas feed is consistent substantially with rate of discharge in course of reaction, react 30min post-samplings, use National Standard Method（Nitrogen oxides-hydrochloride naphthodiamide AAS）NO in determination samplexContent.As a result show, method NOxRemoval efficiency up to 50~70%, to NO under the conditions of heavy forcexRemoval efficiency improve 5~6 times.

Claims (5)

1. a kind of innoxious removing low concentration of NO of high-gravity technologyxMethod, it is characterised in that be process object by 1% nitric oxide of concentration using RPB under the conditions of hypergravity, using nitrogen as balanced gas, using high purity oxygen gas by NOxThe gaseous mixture of 500 ppm concentration is made into, is reacted in a counter-current fashion in RPB, the mixed liquor in reaction using water and hydrogen peroxide reaches innoxious and recycling treatment NO as absorbing liquidxPurpose.
2. the innoxious removing low concentration of NO of high-gravity technology according to claim 1xMethod, absorbing liquid concentration of hydrogen peroxide be 0.01~0.1 mol/L.
3. the innoxious removing low concentration of NO of a kind of high-gravity technology according to claim 1xMethod, be primarily characterized in that, simulated flue gas sample introduction flow velocity and absorbing liquid sample introduction velocity ratio（Q/L）For 2:1~10:1, in a counter-current fashion into RPB, gas is discharged from gas vent after being reacted in RPB, is absorbed rich solution and is flowed out by RPB bottom.
4. the innoxious removing low concentration of NO of a kind of high-gravity technology according to claim 1xMethod, the flow velocity of gas sampling mouthful is 200~1000mL/min.
5. the innoxious removing low concentration of NO of a kind of high-gravity technology according to claim 1xMethod, circulating absorption solution bottle in flow rate of liquid be 30~200mL/min.
CN201610256236.0A 2016-04-25 2016-04-25 The innoxious removing low concentration of NO of high-gravity technologyxMethod Pending CN107303463A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109012078A (en) * 2018-07-20 2018-12-18 云南民族大学 Hypergravity strengthens composite absorption liquid and removes NOxMethod
CN109925861A (en) * 2017-12-19 2019-06-25 中国科学院大学 A method of using hydroxyl radical free radical, Simultaneous Oxidation absorbs NO gas in hypergravity machine
CN111282412A (en) * 2020-03-23 2020-06-16 厦门紫金矿冶技术有限公司 Wet flue gas denitration process for regenerated potassium permanganate
CN112844395A (en) * 2019-11-28 2021-05-28 中冶京诚工程技术有限公司 Oxidation denitration catalyst, and flue gas catalytic oxidation denitration method and device

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CN103055666A (en) * 2011-10-21 2013-04-24 北京化工大学 Method for removing nitric oxide in flue gas
CN203108418U (en) * 2013-01-30 2013-08-07 北京中科创新园环境技术有限公司 Wet process flue gas desulfurization and denitrification integrated device
CN103394279A (en) * 2013-08-15 2013-11-20 北京化工大学 System device and method for deeply removing nitric oxide in industrial tail gas

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109925861A (en) * 2017-12-19 2019-06-25 中国科学院大学 A method of using hydroxyl radical free radical, Simultaneous Oxidation absorbs NO gas in hypergravity machine
CN109012078A (en) * 2018-07-20 2018-12-18 云南民族大学 Hypergravity strengthens composite absorption liquid and removes NOxMethod
CN112844395A (en) * 2019-11-28 2021-05-28 中冶京诚工程技术有限公司 Oxidation denitration catalyst, and flue gas catalytic oxidation denitration method and device
CN112844395B (en) * 2019-11-28 2023-10-31 中冶京诚工程技术有限公司 Oxidative denitration catalyst and flue gas catalytic oxidation denitration method and device
CN111282412A (en) * 2020-03-23 2020-06-16 厦门紫金矿冶技术有限公司 Wet flue gas denitration process for regenerated potassium permanganate
CN111282412B (en) * 2020-03-23 2022-03-01 厦门紫金矿冶技术有限公司 Wet flue gas denitration process for regenerated potassium permanganate

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